From a forthcoming five-track EP of the same name, “Scars” acts as a reminder that Erika Spring (of Au Revoir Simone) knows how to cast an emotional spell and transfix with otherworldly beauty. Co-written and produced by Dap-Kings’ Homer Steinweiss, the lead single addresses Spring’s grief over an early miscarriage. Sadness emanates from the piano-driven track, but there’s power here, too.